Merge tag 'landlock-6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/mic...
[linux-2.6-microblaze.git] / include / net / dsa_stubs.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * include/net/dsa_stubs.h - Stubs for the Distributed Switch Architecture framework
4  */
5
6 #include <linux/mutex.h>
7 #include <linux/netdevice.h>
8 #include <linux/net_tstamp.h>
9 #include <net/dsa.h>
10
11 #if IS_ENABLED(CONFIG_NET_DSA)
12
13 extern const struct dsa_stubs *dsa_stubs;
14
15 struct dsa_stubs {
16         int (*conduit_hwtstamp_validate)(struct net_device *dev,
17                                          const struct kernel_hwtstamp_config *config,
18                                          struct netlink_ext_ack *extack);
19 };
20
21 static inline int dsa_conduit_hwtstamp_validate(struct net_device *dev,
22                                                 const struct kernel_hwtstamp_config *config,
23                                                 struct netlink_ext_ack *extack)
24 {
25         if (!netdev_uses_dsa(dev))
26                 return 0;
27
28         /* rtnl_lock() is a sufficient guarantee, because as long as
29          * netdev_uses_dsa() returns true, the dsa_core module is still
30          * registered, and so, dsa_unregister_stubs() couldn't have run.
31          * For netdev_uses_dsa() to start returning false, it would imply that
32          * dsa_conduit_teardown() has executed, which requires rtnl_lock().
33          */
34         ASSERT_RTNL();
35
36         return dsa_stubs->conduit_hwtstamp_validate(dev, config, extack);
37 }
38
39 #else
40
41 static inline int dsa_conduit_hwtstamp_validate(struct net_device *dev,
42                                                 const struct kernel_hwtstamp_config *config,
43                                                 struct netlink_ext_ack *extack)
44 {
45         return 0;
46 }
47
48 #endif